Filtering device with backwashing function

The utility model discloses a filtering device with a backwashing function. The filtering device comprises a filter, wherein a liquid inlet chamber and a liquid outlet chamber are arranged in the filter. At least two filtering units are arranged in the filter, and each filtering unit is provided with an inlet communicated with the liquid inlet chamber and an outlet communicated with the liquid outlet chamber. A backwashing pipe used for backwashing of one part of selected filtering units to be back washed is further arranged in the filter and is provided with a liquid inlet, a pipe body and a liquid outlet, wherein the liquid inlet is used for being communicated with the inlet of the filtering unit to be back washed in a butting mode, the pipe body is used for isolating the inlet of the filtering unit to be back washed and the liquid inlet chamber, and the liquid outlet is used for reversely discharging fluid in the liquid outlet chamber through the selected filtering unit to be back washed. The backwashing p